摘要:
The present invention relates to an aqueous dispersion containing (a) a fluorescent whitening agent, (b) a dispersing agent, (c) a β-1,3-glucan and, optionally, (d) a vat dye and the use of the aqueous dispersions for whitening synthetic fibres, in particular polyester and polyacrylonitrile.
摘要:
A method is provided for dyeing a non-cellulosic organic material with a dye, preferably a vat dye, comprising (a) treating the material with a dye in the presence of a reducing agent and an alkali and (b) oxidising the treated material produced in step (a) characterised in that the concentration of reducing agent used in step (a) is increased above that used for conventional vat dyeing such that the resultant dyed material has a lightfastness of 5 or more by BS1006 B01 and B02 (1978) and/or has a washfastness or 5 or more by British Standard Test BS1006 C06.C2 (1981). Preferably the step (a) is carried out in the presence of an alkali in concentration of at least 0.5 molar, more preferably 1 molar or more and most preferably 1 to 4 molar. The method provides vat dyed non-cellulosic organic materials having a reflectance of infrared light of wavelength 400nm to 680nm of less than 15 %.
摘要:
A synthetic fibers having a melting or softening temperature of 160°C or more, for example, polyester fibers, are dyed with an organic coloring material having a molecular weight of 370 or more, for example, disperse dye, vat dye and phthalocyanine pigment, at a temperature of 150°C or more, at a high color depth, and the resultant dyed product exhibits a high color fastness to washing or light. The synthetic fibers contain a thermal decomposition-preventing agent comprising at least one isourea of the formula I:
摘要:
A method is provided for dyeing a non-cellulosic organic material with a dye, preferably a vat dye, comprising (a) treating the material with a dye in the presence of a reducing agent and an alkali and (b) oxidising the treated material produced in step (a) characterised in that the concentration of reducing agent used in step (a) is increased above that used for conventional vat dyeing such that the resultant dyed material has a lightfastness of 5 or more by BS1006 B01 and B02 (1978) and/or has a washfastness or 5 or more by British Standard Test BS1006 C06.C2 (1981). Preferably the step (a) is carried out in the presence of an alkali in concentration of at least 0.5 molar, more preferably 1 molar or more and most preferably 1 to 4 molar. The method provides vat dyed non-cellulosic organic materials having a reflectance of infrared light of wavelength 400nm to 680nm of less than 15 %.
摘要:
A process for coloring polymers, which comprises the steps of: dipping a polymer which swells in water or an aqueous solvent mixture or a molding of the polymer in a treating fluid comprising an aqueous solvent mixture containing a colorant having an affinity for the polymer to thereby swell the polymer and at the same time impregnate the colorant into the polymer, and dipping the polymer thus treated in water, an aqueous acid solution or an aqueous solution of an oxidizing agent to fix the colorant to the polymer. When the molding is in contact with a mold, it is possible to carry out swelling and mold release simultaneously.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung eines Hydroxylapatits, welcher als Zahnputzkörper geeignet ist, durch Fällung aus wässriger Phosphorsäure und Calciumhydroxidlösung, wobei man eine Calcium-dotierte Phosphorsäurelösung mit einer Suspension von Calciumhydroxid/oxid in einem dem Hydroxylapatit entsprechendem Molverhältnis von Ca:P = 1,667 gleichzeitig einem Intensivmischorgan zuführt und dort bei Fällungstemperaturen von 60 - 100°C, vorzugsweise 80 - 90°C, und einem pH-Wert von 4 - 8, vorzugsweise von 6,5 - 7,5, umsetzt.